Knee Injuries and pain

While I can't diagnose your specific injury (runners knee?), if you developed this pain without a traumatic injury, you can be sure that this is a repetitive stress injury. You obviously need to rest until the swelling subsides. When you return to running, you need more rest in your routine. You will need to find your own balance. If you want to run 5-6 days a week, try alternating a short 1-2km run with your 10km runs. That should get your blood flowing without irritating your joints.

I read that many knee injuries are a result of weak hip muscles, so you can strengthen and stretch your abductors and adductors while you rest your knee.

You would probably benefit from visiting a chiropractor, physical therapist, or sports therapist.